Should I buy my betta places to hide? Or is he just stressed?

I was given a 3,5 gal with a beautiful, lazy lazy betta two months ago. Yesterday I was deep cleaning the tank because some new gravel I added had turned my water pink. I changed some stuff around to keep the lil guy entertained. The tank I have has some sort of platform that holds the air tube seen in the picture. I failed to properly cover a corner and in less than 12 hrs he's gotten stuck in the tube three times.
I'm worried because twice he's gotten in there and in a matter of seconds stops moving and sinks and just curls up on the bottom.
Could he be stressed and looking for places to hide? I have a couple of fake plants and rocks inside,but no formations. Or is he sick or trying to let himself die? I have no previous fish keeping experience and only go by what I've read in forums. image

The tube came with the tank and I've seen the ones at my LFS set just like that for air. I've read that it doesn't hurt the betta to have extra oxygen.
I did rinse the gravel. I don't have a testing kit though. It's on my list of next purchases.

Useful Searches

Fishlore.com is a participant in the Amazon Services LLC Associates Program,
an affiliate advertising program designed to provide a means for website owners
to earn advertising fees by advertising and linking to Amazon properties
(.com, .co.uk, .ca etc.) and any other website that may be affiliated with the
Amazon Service LLC Associates Program.

This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.